Its been 5 months on nexgard, and I have also used Nu-Stock, and all sorts of other shit and my dog still isn't 100% healed from demodex.I would not recommend nexgard from this experience,and the vet seems like they want to just suck as much money from me as possible rather then heal my dog ASAP.I bought 1% ivermectin today and will begin giving him daily doses.Ill check back in and let everyone know the progress.Im putting this here for the next dog man who runs into this issue.